727 torque converter questions....

I think he meant what will actually fit the trans. I don't know. You do have to watch for "lock up" transmissions. You can easily id these, they "extra stuff" on the valve body, and if you pull the converter, they have a sort of "pilot shaft" with a smooth area right at the front, like a 4 speed

The "non" lock ones have the splines cut right to the end of the shaft